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Christoph Wille c8474419c4 Redesign DecompilerEventSource with Start/Stop tracing and keyword gating The events introduced in #2519 timed only the five per-entity DoDecompile overloads, allocated a Stopwatch and the member's FullName even when no trace session was attached, and reported whole milliseconds, which rounds almost every member to zero. Flat one-shot events also gave PerfView and dotnet-trace no way to show durations or nesting, and the actually expensive stages (type system initialization, assembly resolution probing, the IL/AST transform pipelines, whole-project decompilation) were not instrumented at all. Start/Stop event pairs let trace viewers derive duration and nesting from event timestamps, keywords let a session enable only the areas of interest, and every call site is gated on IsEnabled() so tracing costs a branch when disabled. Per-transform events are Verbose because of their volume; unlike the STEP/Stepper mechanism they work in Release builds. EventSource is in-box for netstandard2.0 and flows over both ETW and EventPipe, so this stays cross-platform with no new dependency. Assisted-by: Claude:claude-fable-5:Claude Code	2 months ago
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DecompilerEventSourceTests.cs	Redesign DecompilerEventSource with Start/Stop tracing and keyword gating	2 months ago

Christoph Wille c8474419c4 Redesign DecompilerEventSource with Start/Stop tracing and keyword gating

The events introduced in #2519 timed only the five per-entity DoDecompile
overloads, allocated a Stopwatch and the member's FullName even when no
trace session was attached, and reported whole milliseconds, which rounds
almost every member to zero. Flat one-shot events also gave PerfView and
dotnet-trace no way to show durations or nesting, and the actually
expensive stages (type system initialization, assembly resolution probing,
the IL/AST transform pipelines, whole-project decompilation) were not
instrumented at all.

Start/Stop event pairs let trace viewers derive duration and nesting from
event timestamps, keywords let a session enable only the areas of
interest, and every call site is gated on IsEnabled() so tracing costs a
branch when disabled. Per-transform events are Verbose because of their
volume; unlike the STEP/Stepper mechanism they work in Release builds.
EventSource is in-box for netstandard2.0 and flows over both ETW and
EventPipe, so this stays cross-platform with no new dependency.

Assisted-by: Claude:claude-fable-5:Claude Code

2 months ago

DecompilerEventSourceTests.cs

Redesign DecompilerEventSource with Start/Stop tracing and keyword gating

2 months ago